Osama bin Laden's dead. That's a good thing.
I would much rather have him in custody awaiting trial. Not possible. Too bad.
Two things to keep in mind:
bin Laden had nothing whatsoever to do with the excursion in Iraq.
And in the What-If category, it's likely bin Laden would have been dealt with at Tora Bora, if not for the machinations of Rumsfeld et al.